Journal
FRONTIERS IN CARDIOVASCULAR MEDICINE
Volume 8, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fcvm.2021.762648
Keywords
coagulation; lymphatic endothelium; lymphatic thrombosis; lymph; lymphedema
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Funding
- National Nature Science Foundation of China [81873473, 91939110]
- Academic Promotion Program of Shandong First Medical University [2019QL014]
- Shandong Taishan Scholarship
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The lymphatic system plays a key role in maintaining internal homeostasis, and the coagulation state in lymph is influenced by various factors. The risk of localized lymphatic coagulation is increased by internal obstructions, external compressions, or abnormaally high lymphatic pressure. The mechanisms of coagulation in lymphatic vessels are complex and influenced by factors such as antithrombin imbalance, endothelial injury, and tissue heterogeneity.
The lymphatic system maintains homeostasis of the internal environment between the cells in tissues and the blood circulation. The coagulation state of lymph is determined by conditions of coagulation factors and lymphatic vessels. Internal obliteration, external compression or abnormally increased lymphatic pressure may predispose to localized lymphatic coagulation. In physiological conditions, an imbalance of antithrombin and thrombokinase reduces lymphatic thrombosis. However, the release of factor X by lymphatic endothelium injury may trigger coagulation casacade, causing blockage of lymphatic vessels and lymphedema. Heterogeneity of lymphatic vessels in various tissues may lead to distinct levels and patterns of coagulation in specific lymphatic vessels. The quantitative and qualitative measurement of clotting characteristic reveals longer time for clotting to occur in the lymph than in the blood. Cancer, infections, amyloidosis and lymph node dissection may trigger thrombosis in the lymphatic vessels. In contrast to venous or arterial thrombosis, lymphatic thrombosis has rarely been reported, and its actual prevalence is likely underestimated. In this review, we summarize the mechanisms of coagulation in lymphatic system, and discuss the lymphatic thrombosis-related diseases.
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